Personnel and environmental protection1.Class I Biosafety Cabinet does not protect the product from contamination because un-purified room air constantly enters into work area.2.As a partical containment unit, the Class I Biosafety Cabinet is suitable for work involving low to moderate risk agents (Biosafety Levels 1, 2 and 3) where there is a need for containment, but not for product protection.3.Unlike conventional fume hood, the HEPA filter in the Class I Biosafety Cabinet protects the environment by filtering air before it is exhausted.4.With the negative pressure, personnel protection is made possible by constant movement of air into the work area.